139997572 has 72 divisors (see below), whose sum is σ = 294773472. Its totient is φ = 57657600.

The previous prime is 139997531. The next prime is 139997591. The reversal of 139997572 is 275799931.

139997572 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 498072 + ... + 498352.

It is an arithmetic number, because the mean of its divisors is an integer number (4094076).

Almost surely, 2^139997572 is an apocalyptic number.

It is an amenable number.

139997572 is an abundant number, since it is smaller than the sum of its proper divisors (154775900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139997572 is a wasteful number, since it uses less digits than its factorization.

139997572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 374 counting only the distinct ones).

The product of its digits is 1071630, while the sum is 52.

The square root of 139997572 is about 11832.0569640279. The cubic root of 139997572 is about 519.2464084116.

The spelling of 139997572 in words is "one hundred thirty-nine million, nine hundred ninety-seven thousand, five hundred seventy-two".